System Technology - NTN-SNR LINEAR AXIS AXC Series Manual

2.

System technology

2.1 Definition
Linear Axis are pre-finished units with a combination of precise guiding and driving elements. Thereby Linear Axis with their variations
are cost efficient and extremely compact components for machines and systems which could be mounted and placed into operation
within a short time.
The selection of Linear Axis could be based on following criteria:
POSITIONING
When positioning repeatability, an arbitrary point is approached several times in one direction from the
REPEATABILITY
same starting point and the deviation to the target value can be measured. The process is repeated
for different points. ± 50% of the difference between maximum and minimum deviation is given as
positioning repeatability.
POSITION ACCURACY
When measuring the positioning accuracy several points are approached in one direction and the
difference between target travel distance and actual travelled distance measured. The position accuracy
is the absolute maximum difference.
RUNNING
The dial gauge is centrally mounted on the carriage and moved over the complete stroke. The running
PARALLELISM
parallelism is the maximum difference between the measured values.
BACKLASH OF BALL The slider unit is moved by the ball screw against a dial gauge as a reference point. Then, the carriage will
SCREWS
be loaded in the same direction by an external force and then unloaded. The backlash is the maximum
difference between the reference point and the position after loading and unloading.
STARTING TORQUE OF
The starting torque is the required drive torque which is necessary to overcome the static friction of the
BALL SCREWS
system and to start the motion.
For the selection of NTN-SNR - Linear Axis our sales and application engineers with years of experience are also available.
2.2 Declaration of incorporation for partly completed machinery
The manufacturer SNR WAELZLAGER GMBH, Friedrich-Hagemann-Straße 66, D-33719 Bielefeld, Germany hereby declares that the
components of the partly completed machinery from the series "Linear Axis AX" and "Linear Axis Systems AS":
• Following essential health and safety requirements in accordance to Annex I of machinery directive 2006/42/EG are
applied and fulfilled:
• The relevant technical documentations are compiled in accordance with part B of Annex VII
• We will transmit in case of a reasoned request by the national authorities the relevant technical documentation in
accordance with part B of Annex VII.
• The above mentioned relevant technical documentations can be obtained from The QC Department, SNR WAELZLAGER
GMBH, Friedrich-Hagemann-Straße 66, D-33719 Bielefeld, Germany
• The conformity is in accordance with the EN ISO 12100:2010 «Safety of machinery - General principles for design - Risk
assessment and risk reduction «
• The partly completed machinery must not be put into service, until the final machinery, into which it is to be incorporated,
has been declared in conformity with the provisions of machinery directive 2006/42/EG if required.
General principles:
1.1 General remarks
1.3 Protection against mechanical hazards
1.5. Risks due to other hazard
1.6. Maintenance
1.7. Information
i.V. Ulrich Gimpel
(Industry Engineering Division Head)
SNR WÄLZLAGER GMBH - Friedrich-Hagemann-Straße 66 D-33719 Bielefeld, Germany
Bielefeld, December 2013
15
(Machinery directive 2006/42/EG)